Method of making condensers



.provement in UNITED STATES PATENT oEEIoE.

WILLARD I-I. KEMPTON, or wILKIEsBUEe, AND PHILLIPS THOMAS, 0E EDGEWOOD,PENNSYLVANIA, ASSIGNORS To WESTINGHOUSE ELECTRIC & MANUFACTURINGCOMPANY, A CORPORATION or PENNSYLVANIA.

No Drawing.

To all whom it may concern.

Be it known that we, WILLARD H. KEMP- TON, a citizen of the UnitedStates, and a resident of VVilkinsburg, in the county of Allegheny andState of Pennsylvania, and PHILLIPS THOMAS, a citizen of the UnitedStates, and a resident of Edgewood, in the county of Allegheny and Stateof Pennsylvania, have invented a new and useful Im- Methods of MakingCondensers, of which the following is a specification.

Our invention relates to condensers and it has, for its primary object,the provision of a method which shall facilitate the c0nstru0- tion ofcondensers comprising superimposed layers of insulating material and aconducting material treated with a suitable wax.

It is well known, to those familiar with the art, that halowax, which isa chlorinated naphthalene, possesses certain electrical properties whichparticularly adapt it for use as a dielectric in condensers. hese1nherent advantageous properties are offset, however, to a certainextent, by the injurious effects which halowax has upon the workmen whoconstruct the condensers, the wax being especially irritable to the skinwhen brought in contact therewith. One object of our invention resides,therefore, in the provision of a method by which condensers employinghalowax as an impregnating agent may be constructed and which will avoidthe injurious efiects of the halowax experienced by the workmen.

Our invention will be more fully understood by a brief description ofthe method of constructing condensers employing a suitable wax as animpregnating agent. Condensers of the above designated character areordinarily formed by employing a suitable conducting material and aninsulating material, such as paper. Sheets of suitable size of each ofthese materials are cut and stacked in alternate relation or a pluralityof strips of conducting material, insulated from each other by strips ofpaper or other suitable material, are wound to form the condenser. Suchsuperposed material is then subjected to a bath of molten wax,

which, in this case, is chlorinated naphthalene or halowax, until thepaper or insulatin material is thoroughly imdpregnated, after which thebody is remove Specification of Letters Patent.

from the Patented Sept. 16, 1919.

Application filed March 7, 1919. Serial No. 281,223.

wax and allowed to cool, usually being disposed in a cold press.

The stacked material is then provided with'a plurality of terminalsconnected to the respective layers of conducting material. In order tosecure'terminals properly to the conducting material, it is essentialthat the wax be removed from certain portions of the conducting materialto which the condensers are to be fastened. This, therefore,necessitates considerable handling of the impregnated body and, whenhalowax is employed as the impregnating agent, this handling is madedifficult on account of the injurious effects of the halowax upon theworkmen.

We have discovered that the injurious efiectsof the halowax may beavoided by coating the impregnated stacked material with a protectivecoating of suitable material, such as shellace. This protective coatingmay be provided by dipping the cooled condenser in shellac and allowingit to dry, the coating of shellac being of only sufiicient thickness tocompletely cover the coating of halowax. We have found that a coating ofshellac may be employed in this manner without any injurious effectsupon the dielectric qualities of the halowax. This coating of shellacmay be applied before the terminals are secured to the conductingmaterial to thereby protect the workmen from the effects of the halowaxwhen handling the stacked material in the process of fastening theterminals thereto.

A condenser formed in this manner is then disposed in any suitableprotective casing of suflicient thickness to protect it from shocks orblows experienced in its commercial use. It should be noted that thecoating of shellac applied to the condenser is intended only for theprotection of the workmen while constructing the condenser and is notintended to act as the protective coating for the condenser after it hasbeen completely formed and ready for commercial use.-

Although we have specifically described a method by which condensers maybe constructed in accordance with our invention, it is obvious thatminor changes may be made therein without departing from the spirit ofour invention, and we desire that no limitations shall be imposed exceptsuch as are indicated in the appended claims;

We claim as our invention:

1. A method of constructing condensers that comprises superposingalternate layers of conducting material and insulating material,impregnating the insulating material With chlorinated naphthalene,providing the body thus formed with a relatively thin coating ofmaterial non-injurious to the skin, securing terminals to the conductingmaterial and disposing the body in a suitable casing.

2. A method of constructing condensers that comprises superposingalternate layers of conducting material and insulating material,subjecting the superposed material to a bath of chlorinated naphthalene,applying pressure to the body in a cold press, coating the body withshellac, securing terminals to the conducting material and disposing thebody in a suitable casing.

33. The method of constructing condensers that comprises impregnating anassembled condenser with chlorinated naphthalene and providing the bodythus formed With a relatively thin coating of material non-injurious tothe skin.

In testimony whereof, We have hereunto subscribed our names this 13thday of Feb, 1919.

WILLARD H. KEMPTON. PHILLIPS THOMAS.

